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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec5d9770f3876984565d221fdca516fc805883799b723d67272f79ea047c791' 
  AND token = 'ig+SjVBmiWV0EA3hda2/n/d3XAiN2WPFa/40JsPdpXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}